Tube and mode of making the same



(No Model.) D A. GARVER & I-I STRAIGHT- TUBE AND MODE OF MAKING THESAME.

No. 385,109. Patented June 26, 188 8.

,ence marked thereon.

DAVID A. GARVER AND CLARENCE H. STRAIGHT, OF BRYAN, OHIO.

MAKING THE SAME.

SPECIFICATION forming part of Letters Patent No. 385,109, dated June 26,1888.

Serial No. 268,691. (No model.)

To all whom, it may concern:

Be it known that we, DAVID A. GARVER and CLARENCE H. STRAIGHT, of Bryan,in the County of Williams and State of Ohio, have invented certain newand useful Improvements in Tubing and Process of Making the Same and wedo hereby declare the following to be a full, clear and exactdescription of panying drawings, forming a part of this specifieation,and to the figures and letters of refer- The object of the presentinvention is to produce a tube for use in the mechanical arts which shall possess great rigidity and strength as compared with the ordinarycylindrical tube now in use and at a cost slightly, if at all, greaterthan such cylindrical tubing.

To this end the invention consists in a tube formed with sections of itscireum fcrence substantially straight on both surfaces, the por tions ofthe tube between such straight sections being more or less curved.

The invention further consists in an improved method of forming suchtube, all as will be hereinafter described, and pointed out particularlyin the claims at the end of this specification.

In the accompanying drawings, Figure 1 represents a front elevation of apair of rolls for forming our improved tube. Fig. 2 is a perspectiveview of a pair of dies employed for the same purpose. Fig.= 3 is aperspective view of a short section of the tube, and Fig. 4 is an endview of the same.

Similar letters of reference in' the several figures indicate the sameparts. a

In forming this tubing we preferably take the ordinary seamlesscylindrical tubing, such as is now found on the market, and pass itbetween rolls having their faces shaped similar to the rolls A A, bywhich it is pressed inward at points 13 on two sides, the intermediatesections of the tube being bulged out until they fill the spaces Din therolls, and form flanges or wings extending from end to end of the tube.The portion of the tube forced into the spaces D, it will be seen, conforms on the inner as well as on the outer surface to, substantially,the sh ape of such spaces,

and as the ends of the spaces are flat the ends of the wings or flangeswill also be fiat on both surfaces. In order that these straight or flatsections shall be slightly thicker than the other portions of the tube,to resist lateral strain as well as to present thicker surfaces forwear, the surface areas of the spaces D are made somewhat smaller thanthe surface areas of the sections of pipe to fill them, the result beingthat more of the metal is crowded into the ends of the spaces and thedesired result accomplished.

The sides E of the flanges or wings may, of course, be of any desiredwidth, and although preferably made at right angles to the end sectionsthey may converge slightly toward their outer edges, as will be readilyunder stood.

In producing the pipe with the dies illustrated in Fig. 2 differentsections of the pipe are successively compressed, or dies of thischaracter may be employed where it is desirable to compress only aportion of the pipe, in order to resist lateral strain brought to bearat some particular point.

From the above it will be seen that we have produced a tube which isparticularly well adapted to withstand lateral strain, and which may beused in many places where it has been found impracticable or undesirableto employ the cylindrical tubefor instance, in the construction ofsingle or double trees, shafts of carriages and wagons, wheelbarrows,and in any of the many places where it is found de sirable to employ atubing of great lateral strength.

Although we have described our tube as hav ing absolutely straightsections, it is obvious that such will not be the case in actualpractice, and we do not wish to be limited to such exact construction.It is also obvious that while the outer surface may be straight theinner surface of the straight sections may be slightly concave, owing tothe former curvature of the metal or to the crowding in of the stock, asbefore mentioned. Nor do we wish to be limited to a tube having twostraight sections, as a greater or less number may be employed to goodadvantage.

Having thus described our invention, what we claim as new, and desire tosecure by letters patent, is-

1. As an improved article of manufacture, a tube having thelaterally-projecting flanges or wings, both surfaces of the ends ofwhich are substantially straight, as set forth.

2. As an improved article of manufacture, a tube having thelaterally-projecting flanges or wings, the ends of said flanges or wingsbeing relatively thicker than the other portions of the tube,substantially as described.

3. As an improved article of manufacture, a tube having thelaterally-projecting flanges or wings, the ends of said flanges or wingsbeing relatively thicker than the other portions of the tube, bothsurfaces of said thicker portions being substantially straight, as setforth.

4. The herein-described process of forming flanged metal tubes,consisting in compress-

